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...of the [[Allegheny River]] and the [[Monongahela River]] that forms the [[Ohio River]]. The '''history of Pittsburgh''' began with a struggle between Native Am

...expedition sent out by the Ohio Company of Virginia to build a fort on the Ohio River, at what is now [[Pittsburgh, Pennsylvania|Pittsburgh]]. Washington discove

...ted above the Fall Line. The goal was to unite the Chesapeake Bay with the Ohio River system the way the Erie Canal had opened up the Great Lakes below Niagara.

...Georgia, Alabama, and Mississippi, from the Appalachian Mountains into the Ohio River just upstream of the Ohio's discharge to the Mississippi River. ...(U.S. state)|Minnesota]]. The main tributaries of the Mississippi are the Ohio River, the Tennessee River, the Arkansas River, and the Missouri River. With its

Tests by general aviation pilots in Alaska and air transport carriers in the Ohio River Valley, the FAA determined in 2005 that ADS-B is ready to be made operation

...between Great Britain and the United States. In the West (northwest of the Ohio River) the United States was battling the Indians, who seemed to have support fro

...of timber were expanding activities. The land drained to the [[Ohio River|Ohio River Valley]], and trade tended to also center in that direction.

...1850]]. Every year a few hundred runaway slaves fled the South across the Ohio River to the North via the [[Underground Railroad]]. After 1854, Republicans fum ...olidified into one contiguous geographic area. The dividing line was the [[Ohio River]] and the [[Mason-Dixon line]] (between slave-state Maryland and free-state

...the Great Lakes (Buffalo, Cleveland, Detroit, Chicago, Milwaukee), on the Ohio River (Pittsburgh, Cincinnati, Louisville), or the Mississippi (St. Louis and all

...eptualizing a solution for territorial government in the land north of the Ohio River. Virginia ceded its land claims to the national government, Jefferson propo

...rd-scrabble old-stock farmers in remote areas of New England and along the Ohio River valley.<ref>Kleppner (1979); Jensen (1971)</ref>

...aws for the gradual emancipation of slaves. South of Pennsylvania and the Ohio River, states qualified or ignored the revolutionary implications of the liberal